In this section, we propose a two-stage procedure for constructing adversarially robust estimators based on the explicit relation pointed out in the previous section. This relation allows us to incorporate specific model information, such as sparsity, into adversarially robust estimates through standard estimate. The idea of the proposed method is similar to the estimators in [1]}, [2]} and the method is straightforward. We emphasize that such a simple two-stage method is powerful enough to achieve minimax optimal.
